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Define the standard heat of combustion

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Standard enthalpy of combustion is defined as the enthalpy change when one mole of a compound is completely burnt in oxygen with all the reactants and products in their standard state under standard conditions (298K and 1 bar pressure).
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This is the energy liberated when a substance undergoes complete compustion, with excess of oxygen at standard condition. 
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This is the energy liberated when a substance undergoes complete compustion, with excess of oxygen at standard condition. 
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